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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59ec63b3e20576e5a05c2b1b0d3fff0d1abb6e1fd13a81e4d2c6ca2fba7ca472' 
  AND token = 'DrIGa1L7VrEZwFroml7HGnrx8pUqhC4nM/uEz8pMaH4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}